If you previously enrolled a smartphone in Two-Step Login (Duo), but now have a new device with the same phone number:

Go to Two-Step Login (Duo) from any device except the new device. If prompted, log into CAS and complete a two-step login with Duo (on the Two-Step Login page within CAS, choose either Call Me, or Enter a Passcode followed by Text me new codes.

Notes:

If you have enabled the autopush settings, you may have to click Cancel on the CAS page before you can click Call Me or Enter a Passcode.

Even though your previous phone is still enrolled in Duo, the call or text message will be sent to the phone number and should arrive to your new phone, allowing you to log in.

Click Your devices & settings, and then authenticate again via CAS and Duo.

In the "Management" section, click Change device settings.

Use the Duo Control Panel to complete (another) two-step login (Step 1 in the instruction panel).

In the Duo Control Panel, find your device, click its Device Options, and then select Reactivate Duo Mobile.

Select the correct operating system for your device (e.g., Android, iPhone, or Windows Phone), and then click Continue.

If the Duo Mobile app is already installed on the device, click I have Duo Mobile. If Duo Mobile is not already installed on the device, follow the "Install Duo Mobile for..." instructions displayed in the Duo Control Panel, and then, once Duo Mobile is installed, click I have Duo Mobile.

Under "Activate Duo Mobile for...", follow the on-screen instructions for using Duo Mobile to scan the provided QR code. When the code is scanned successfully, a green checkmark will appear over the code.